Open to opportunities

Sergio JR Mangaser

@sergiojrmangaser

I deliver L2/L3 enterprise network support, security migrations, and reliable service restoration across complex environments.

Canada

Message

I deliver enterprise network projects including network segmentation, guest Wi-Fi upgrades, data center relocation, Palo Alto firewall migration, and SPBM/ISIS-to-BGP redistribution. I provide L2/L3 escalation support across Cisco, Fortinet, Aruba, Extreme, Avaya, HPE, and Cisco Meraki environments while meeting SLA and MTTR targets.

I've also supported enterprise SD-WAN, transport, Wi-Fi, 5G, and data center deployments at DITO Telecommunity and Asticom, including the Clark International Airport High-Speed Managed Wi-Fi project. Across more than 10 years in networking and telecommunications, I combine hands-on troubleshooting, testing, documentation, vendor coordination, and team leadership to restore services and implement reliable infrastructure.

Experience

Work history, roles, and key accomplishments

Technical Consultant II

TCP Network Services

Jan 2025 - Apr 2026 (1 year 3 months)

Delivered enterprise network projects including network segmentation, guest Wi-Fi upgrades, data center relocation, and firewall migrations. Provided L2/L3 support and escalation for enterprise and managed-service customers, maintaining SLA and MTTR targets.

Technical Service Delivery Engineer

DITO Telecommunity

Mar 2024 - Nov 2024 (8 months)

Supported deployment and service delivery of enterprise network solutions involving routers, switches, Wi-Fi, CCTV, 5G CPEs, SD-WAN, and transport circuit devices. Performed L1/L2/L3 troubleshooting, testing, service validation, and acceptance activities for business enterprise customers.

Technical Service Engineer

Asticom Group of Companies

Aug 2022 - Feb 2024 (1 year 6 months)

Performed testing, validation, troubleshooting, and technical assessment of enterprise networking and telecommunications products prior to production deployment. Tested routers, switches, SDH, Wi-Fi, SIP Voice, 4G/5G CPEs, transport circuits, and SD-WAN technologies.

Routers Switch 4G 5G Transport Circuits SD WAN Cisco Meraki Fortinet IP Planning Subnetting Router Switch Management Addressing Network Configuration Nokia Cisco Raisecom R&D GPON Technical Training

Assistant Project Manager

Commsec Inc.

Sep 2020 - May 2022 (1 year 8 months)

Coordinated telecommunications implementation activities involving customers, subcontractors, field engineers, and project stakeholders. Successfully coordinated 20 implementation teams while maintaining project timelines and delivery targets.

Coordination Project Management Team Coordination

Quality Supervisor

Invenit Micronology Information Technology Solutions

Jan 2020 - Apr 2020 (3 months)

Led and managed multiple teams consisting of 20 to 30 members, ensuring alignment with project goals and delivering high-quality results within deadlines. Presented findings from site inspections and audits to management, ensuring tower erection and civil construction activities adhere to quality standards.

Team Leadership Quality Assurance Site Inspections Audit Project Management Civil Construction Tower Construction Quality Standards

Site Engineer

S.P. Deloraya Consulting

Dec 2015 - Dec 2019 (4 years)

Progressed to Site Engineer Team Leader, managing approximately 30 Site Engineers and coordinating daily technical activities, resources, subcontractors, and stakeholders. Successfully participated in the installation and commissioning of network, wireless, microwave, and transport equipment across approximately 3,000 cell sites throughout the Philippines.

Site Engineering Team Leadership Project Coordination Wireless Microwave Transport Commissioning Cellular Network Sites Stakeholder Management

RAN Site Engineer

Elabram Systems Inc.

Apr 2015 - Dec 2015 (8 months)

Prepared technical documentation covering equipment installation, configurations, site surveys, and testing results. Conducted technical site surveys and prepared approximately 100 technical survey reports for new and enhanced directional antenna and RRU deployments.

Technical Documentation Equipment Installation Configuration site surveys Testing Directional Antenna RRU Deployments

Site Engineer

Avecs Corporation

Apr 2012 - Apr 2015 (3 years)

Installed, integrated, tested, commissioned, expanded, and rectified wireless BTS and telecommunications equipment. Supported Huawei, Ericsson, Nokia, and Alcatel wireless equipment and performed onsite troubleshooting and acceptance testing.